STV9553 Datasheet, PDF (9/24 Pages) STMicroelectronics – 12 ns TRIPLE-CHANNEL HIGH VOLTAGE VIDEO AMPLIFIER

STV9553
7 POWER DISSIPATION
The total power dissipation is the sum of the static DC and the dynamic dissipation:
P_TOT = P_STAT + P_DYN.
The static DC power dissipation is approximately:
P_STAT = V_DD x I_DD + V_CC x I_CC
The dynamic dissipation is, in the worst case (1 pixel On/ 1 pixel Off pattern):
P_DYN = 3 V_DD x C_L x V_OUT(PP) x f x K (see Note 6)
where f is the video frequency and K the ratio between the active line and the total horizontal line duration.
Example:
for V_DD = 110V, V_CC = 12V,
I_DD = 15mA, I_CC = 40mA,
V_OUT = 40 V_PP, f = 25MHz,
C_L = 8pF and K = 0.72.
We have:
P_STAT = 2.13W and P_DYN = 1.90W
Therefore:
P_TOT =4.03W.
Note 6: This worst thermal case must only be considered for TJmax calculation. Nevertheless, during the average life
of the circuit, the conditions are closer to the white picture conditions.
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